Adams



(No Model.)

- J. s. ADAMS.

CLAMP.

No. 256,530.' PatentedApr. 18, 1882.

N. PETERS. Photclimngmphr, wnshngum. ELC.

UNiTnD STATES PATENT OFFICE.

JOHN S. ADAMS, OF BOSTON, MASSACHUSETTS.

CL'AM P.

SIECIFICATION forming part of Letters Patent No. 256,530, dated AprilV 18, 1882.

Application led August 29, 1881. (No model.)

The object of my invention is to produce a more convenient and effective clamp for the use 1o of cabinet-1nakers,joiner, &e.,than those now in use; andthe invention consists in the employm'entof a spring attached to the sliding` jawin such a manner as to hold the clamp-iron up to the bar, so as to insure its engaging with x5 the notches on the barwithout the necessity of holding up the clamp-iron with the hand when the clamp is required for use.

In clamps ot this character as now made the clamp-iron, when not in use, drops down zo away from lthe bar, and when required for use it is necessary to hold the clamp-iron up tothe bar to engage it in the notches. This ineon- Yenience is obviated by lny invention.

Referring to the drawings,Figurel is 'a side 2 5 view ot' a clamp with inyimproveinent applied thereto. Fig. 2 is a similarview,partlyiu section; and Fig. 3 is a view of the under side of the same.

Ais a bar ot' the ordinary construction, pro- 3o vided with a head, B, a'nd screw O at one end,

and with notches a on the underside. To the sides ot' the chuck orjaw D, and inclosing the barA,so as to slideV freelythereomis attached a clasp of thin sheet metal or other suitable material, F.

To the under side or"- the clasp Fis attached athin spring, G, of sheet metal or other suitable elastic material, which extends forward and holds the clamp-iron E in the notches a, as shown. rlhe notches a are cut with an inclination at one side, so that the clamp-iron can be easily -pushed l'orward to engage in the same. When the article clamped is to be released and the sliding jaw drawn back itis *onlynecessary-to press the spring G down antLASv release the clam p-iron from the notches.

Witnesses:

J. H. ADAMS, B. OHARA. 

